“The term ”ścarbon footprint’ is used to describe the amount of
greenhouse gases that are emitted into the atmosphere each year by a
person, household, building, organization or company,”Ł said Cathy
Milbourn, a spokeswoman for the federal Environmental Protection Agency.

One
of the main sources of greenhouse gases is the home. “For individuals,
about 40 percent of our carbon emissions come from our homes,”Ł said
Eric Carlson, the executive director of Carbonfund.org, an environmental group in Silver Spring, Md.